Make Null a public class of dart:core.

runtime/vm/flow_graph_builder.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/flow_graph_builder.h"
 
 #include "lib/invocation_mirror.h"
 #include "vm/ast_printer.h"
 #include "vm/bit_vector.h"
 #include "vm/code_descriptors.h"
@@ skipping 1205 matching lines @@
                                        Bool::False() : Bool::True()));
     return;
   }
 
   // Eliminate the test if it can be performed successfully at compile time.
   if ((node->left() != NULL) &&
       node->left()->IsLiteralNode() &&
       type.IsInstantiated()) {
     const Instance& literal_value = node->left()->AsLiteralNode()->literal();
     ConstantInstr* result = NULL;
-

[regis, 2013/08/15 17:27:26]

Any particular reason to remove these 2 blank lines? Or is it just a not quite
reverted change?

[rmacnak, 2013/08/15 17:56:04]

No reason, just an artifact of merging with dart2js folks making the same
change.

     Error& malformed_error = Error::Handle();
     if (literal_value.IsInstanceOf(type,
                                    TypeArguments::Handle(),
                                    &malformed_error)) {
       result = new ConstantInstr(negate_result ?
                                  Bool::False() : Bool::True());
     } else {
       result = new ConstantInstr(negate_result ?
                                  Bool::True() : Bool::False());
     }
     ASSERT(malformed_error.IsNull());
-
     ReturnDefinition(result);
     return;
   }
 
   ValueGraphVisitor for_left_value(owner(), temp_index());
   node->left()->Visit(&for_left_value);
   Append(for_left_value);
   PushArgumentInstr* push_left = PushArgument(for_left_value.value());
   PushArgumentInstr* push_instantiator = NULL;
   PushArgumentInstr* push_type_args = NULL;
@@ skipping 2421 matching lines @@
   intptr_t len = OS::SNPrint(NULL, 0, kFormat, function_name, reason) + 1;
   char* chars = Isolate::Current()->current_zone()->Alloc<char>(len);
   OS::SNPrint(chars, len, kFormat, function_name, reason);
   const Error& error = Error::Handle(
       LanguageError::New(String::Handle(String::New(chars))));
   Isolate::Current()->long_jump_base()->Jump(1, error);
 }
 
 
 }  // namespace dart